UI freezes while the client sends messages.

[simnalamburt]

Description:
When sending a message, the UI becomes unresponsive. This causes a poor user experience, and it would be better to handle this asynchronously.

Proposal:
To improve usability, consider implementing asynchronous processing for message sending.

Additional Context:
@ulyssa, I'm willing to work on fixing this issue myself. Could you please provide some guidance on which part of the codebase would be a good starting point?

[simnalamburt]

I’ve noticed that the UI often freezes during various other interactions involving Iamb as well. It might be beneficial to refactor all I/O operations to be handled asynchronously or move them to a dedicated I/O thread.

[thibaultamartin]

Attempting to join a room or send a file can cause similar freezes. I'm happy to provide logs if that's of any help